Create/edit file ~/Library/KeyBindings/DefaultKeyBinding.dict

{
"\UF729"  = moveToBeginningOfLine:; // home
"\UF72B"  = moveToEndOfLine:; // end
"$\UF729" = moveToBeginningOfLineAndModifySelection:; // shift-home
"$\UF72B" = moveToEndOfLineAndModifySelection:; // shift-end
"^\UF729" = moveToBeginningOfDocument:; // ctrl-home
"^\UF72B" = moveToEndOfDocument:; // ctrl-end
"^$\UF729" = moveToBeginningOfDocumentAndModifySelection:; // ctrl-shift-home
"^$\UF72B" = moveToEndOfDocumentAndModifySelection:; // ctrl-shift-end
}